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According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत् शेषवत् सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत् शेषवत् सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धदर्शनं लिङ्गदर्शनं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the darshana (perception obtained through the indriyas and manas) of the relation between the Linga (लिङ्ग । mark) and Lingi (लिङ्गि । object indicated by the mark) and also darshana of Linga itself. The darshana (perception) of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana). (Page 26 of Reference<ref name=":6" />)  

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धदर्शनं लिङ्गदर्शनं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the darshana (perception obtained through the indriyas and manas) of the relation between the Linga (लिङ्ग । mark) and Lingi (लिङ्गि । object indicated by the mark) and also darshana of Linga itself. The darshana of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana). (Page 26 of Reference<ref name=":6" />). Thus anumana depends totally on previous experiences through pratyaksha and this knowledge follows other kinds of knowledge. Example : where there is smoke there is fire.

Tarkasamgraha defines Anumana as  <blockquote>अनुमितिकरणमनुमानम्॥१॥ परामर्शजन्यं ज्ञानमनुमितिः॥२॥ व्याप्तिविशिष्टपक्षधर्मताज्ञानं परामर्शः ।<ref>Tarkasamgraha ([https://sa.wikisource.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A5%8D%E0%A4%95%E0%A4%B8%E0%A4%99%E0%A5%8D%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A4%83/%E0%A4%85%E0%A4%A8%E0%A5%81%E0%A4%AE%E0%A4%BE%E0%A4%A8%E0%A4%A8%E0%A4%BF%E0%A4%B0%E0%A5%82%E0%A4%AA%E0%A4%A3%E0%A4%AE%E0%A5%8D Anumana Nirupana])</ref></blockquote>Anumana is of three kinds with each of them having two definitions with elaborately described examples by Vatsyayana for the Nyaya Sutras given by Gautama.

 

Tarkasamgraha defines Anumana as  <blockquote>अनुमितिकरणमनुमानम्॥१॥ परामर्शजन्यं ज्ञानमनुमितिः॥२॥ व्याप्तिविशिष्टपक्षधर्मताज्ञानं परामर्शः । <ref>Tarkasamgraha ([https://sa.wikisource.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A5%8D%E0%A4%95%E0%A4%B8%E0%A4%99%E0%A5%8D%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A4%83/%E0%A4%85%E0%A4%A8%E0%A5%81%E0%A4%AE%E0%A4%BE%E0%A4%A8%E0%A4%A8%E0%A4%BF%E0%A4%B0%E0%A5%82%E0%A4%AA%E0%A4%A3%E0%A4%AE%E0%A5%8D Anumana Nirupana])</ref></blockquote>Anumana is of three kinds with each of them having two definitions with elaborately described examples by Vatsyayana for the Nyaya Sutras given by Gautama.

=== Purvavat (पूर्ववत्) ===

=== Purvavat (पूर्ववत्) ===

<blockquote>पूर्ववदिति, यत्र कारणेन कार्य्यमनुमीयते। यथा मेधोन्नत्या भविष्यति वृष्टिरिति । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 and 66 of Reference <ref name=":5" />)</blockquote>Purvavat Anumana is that in which the effect is inferred from the cause; e.g. when we see the clouds rising, we infer that there will be rain. The cause is 'purva' or prior to the effect ; hence that in which the Anumana is based on the cognition of the cause has been called Purvavat. (Page 26 of Reference <ref name=":6" />)<blockquote>अथवा पूर्ववदिति, यत्र यथा पूर्व्वं प्रत्यक्षभूतयोरन्यतरदर्शनेन अन्यतरस्य अप्रत्यक्षस्यानुमानम् । यथा धूमेनाग्निरिति । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 and 66 of Reference <ref name=":5" />)</blockquote>Purvavat Anumana is that in which out of two things as perceived on some former occasion, the one that is not perceived (at the time of inference) is inferred from the darshana of the other; e.g. when fire is inferred from smoke. (Page 26 of Reference <ref name=":6" />)

<blockquote>पूर्ववदिति, यत्र कारणेन कार्य्यमनुमीयते। यथा मेधोन्नत्या भविष्यति वृष्टिरिति । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 and 66 of Reference <ref name=":5" />)</blockquote>Purvavat Anumana is that in which the effect is inferred from the cause; e.g. when we see the clouds rising, we infer that there will be rain. The cause is 'purva' or prior to the effect ; hence that in which the Anumana is based on the cognition of the cause has been called Purvavat. (Page 26 of Reference <ref name=":6" />)<blockquote>अथवा पूर्ववदिति, यत्र यथा पूर्व्वं प्रत्यक्षभूतयोः अन्यतरदर्शनेन अन्यतरस्य अप्रत्यक्षस्य अनुमानम् । यथा धूमेनाग्निरिति । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 and 66 of Reference <ref name=":5" />)</blockquote>Purvavat Anumana is that in which out of two things perceived on some former occasion, perception of one of the two things leads to inference of the other (which is not being perceived); e.g. when fire is inferred from smoke. (Page 26 of Reference <ref name=":6" />)

=== Sheshavat (शेषवत्) ===

=== Sheshavat (शेषवत्) ===